Manual massage instrument



FIG. 1 is a side elevation of a manual massage instrument embodying my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a front perspective view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a manual massage instrument, substantially as shown and described. 